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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee3574247cf8927314fc9da87f0f2c1b7d3ddb95f17f716853218e1fef8b6d2' 
  AND token = '7bhzxJcIUCS7sbO8OtjfWrcFbt6zkmLjQfpwheVegN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}